Optional argument param about argagg HOT 3 CLOSED

You can always handle it in your code

int logLvl = 0;   // Off by default
if(args["log"]) {
   logLvl = 3;   // Enable default level
   if(args["log"].as<std::string>()=="errors-only") logLvl = 1;  // Use custom
}

from argagg.

Yea, my concern with having that style of optional argument is that it actually introduces a third state to the flag. Also, it messes with the current greedy argument behavior. For example, foo --log --verbose would make --verbose an argument to --log.

• flag not specified
• flag specified followed by non-flag
• flag specified followed by a flag (and thus specified without argument)

Currently a flag has two states:

• flag not specified
• flag specified with argument

I feel like if there's some default behavior you want with a flag specified with no argument it can be captured by its own flag. Consider git log for example, --oneline is equivalent to --pretty=oneline.

from argagg.

I'm going to close this for now though I'm open to further discussion in this issue.

from argagg.